The properties of a SF naturally depend on parameters such as its temperature and the interaction strength between its particles. In the limit of vanishing temperature T → 0, the two-fluid model predicts that first sound (i.e., standard sound waves) corresponds to a propagating pressure oscillation with constant entropy, while second sound is an entropy oscillation propagating at constant pressure 8. ![]() The NF component carries all the entropy and has non-zero viscosity. The SF component has no entropy and flows without dissipation. It was experimentally discovered 4 in 1944 in He II 5 and was described with a hydrodynamic two-fluid model 2, 6, 7, 8 which treats He II as a mixture of a superfluid (SF) and a normal fluid (NF). Second sound is a transport phenomenon of quantum liquids that emerges below the critical temperature for superfluidity T c 1, 2, 3.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |